Heating apparatus



May 12, 1925.

A. C. MACBETH HEATING APPARATUS Filed Oct. 27. 1924 2 Sheets-Sheet 2 Jay. 6.

INVENTOR v A/e/"f C. fl aceffi m ATTORNEY Patented May 12, 1 925.

ALBERT C. MACBETH, OF SEATTLE, WASHINGTON.

HEATING APPARATUS.

Application filed October 27, 1924. Serial No. 745,986.

To all whom it may concern:

Be it known that I, ALBERT C. MAOBETH, a citizen of the United States, residing at Seattle, in the county of King and State of lVashington, have invented certain new and useful Improvements in Heating Apparatus, of which the following is a specification.

This invention relates to heating apparatus and more especially to a flue device which is connected with or attached to a heating stove.

The object of the invention is to produce a fine device of this character which will afloul additional radiating surfaces whereby the heat contained in the exhaust chimney gases may be more fully utilized.

The invention consists in the novel construction, adaptation and combination of parts hereinafter described and claimed.

In the accompanying drawings,-

Figure 1 is a plan view of a heating stove embodying my improvements; and Figs. 2, 3, and 4 are sectional views taken substantially on lines 22, 33 and 44 of Fig. 1. Figure 5 is a modified form of the invention shown applied as an attachment of a stove which may be of any known suitable construction; and Figs. 6 and 7 are sectional views taken substantially on lines 6-6 and 7-7 of Fig. 5. Fig. 8 is a side elevation of the apparatus and a portion of the stove illustrated in Figs. 5 to 7 The same reference characters indicate corresponding parts in the several views.

Referring first to Figs. 1 to 4, inclusive, the numeral9 designates the body of a stove containing a combustion chamber 10. The rear wall 11 of the chamber constitutes a partition which serves as the front wall of a heating chamber 12 whose rear and side walls 13 and 14, respectively, are provided by a sheet of metal rigid with or formed as a part of the peripheral wall 15 of the body of the stove proper. 16 represents an inner wall or liner to protect the stove walls 11 and 15 from extreme heat which may obtain within the combustion chamber. 7

The heating chamber 12 is in the nature of a duct open at the bottom and top to permit the passage of air therethrough.

17 represents a horizontal flue, hereinafter designated as the manifold, extending transversely of said heating chamber and is supported by the casing side walls 14 by having its extremities fit within apertures provided in the latter near the bottom of the same.

- from the stove top per ends of the side flues 24 are connected orformed integral (as shown in Figs. 1 and 4) with elbows 25, one for each, said elbows having horizontally disposed ends which extend, as at 26, through apertures provided in the partition 11 and liner 16 into the upper portion of the combustion chamber 10.

The central vertical'flue 23 has its upper end connected in axial alignment with a smoke pipe 27 by means of a T-fitting 28 having a branch 30 which is connected to a by-pass pipe 29 which extends horizontally between the elbows 25 through apertures provided respectively in said partition and liner.

The flues 23 and 24 are of the same diameters, or nearly so. 31 represents a damper for closing the inlet end of the bypass pipe 29, said damper, as shown, being carried by a controlling rod 32 mounted for endwise movement in a hanger 33 depending In the operation of the embodiment of the invention above described; for starting a fire, the damper 31 is advantageously posi tioned in about the position in which it is represented by full lines in Fig. 2 thereby permitting the volatile gases of combustion from the chamber 10 to pass directly through. the by-pass 29 into the smoke pipe After a chimney draft has been established of sufficient power, the damper is moved by the operator into the position in which it is represented by dotted lines in Figs. 1 and 2, resulting in closing communication through the bypass 29.

When this occurs, the smoke and other gases from the combustion chamber pass downwardly through the two side fines 24 into the manifold 17 and thence upwardly through the flue 23 to the smoke pipe 27. All as represented by direction arrows in Figs. 1, 3 and 4.

By reason of the combined transverse areas of the down-flow fines 24 being greater 17 are open to" than the transverse area of the up-fiow flue 23, the relatively limited capacity of the latter serves to retard the travel of the hot gases from the manifold thereby affording time in which the heat from such gases is transmitted through the flue walls to the air surrounding the same in the heating chamber 12. The air within the heating chamber being thus affected is caused to as cend as indicated by feathered arrows in Figs. 2-and 4 resulting in the cooler portions of the air from below being warmed and carried upwardly to effect a circulation of air in a room to warm the same throughout in a most rapid and efficient manner.

The modified construction as represented in Figs. 5 to 8, inclusive, is generally similar to the hereinbefore described embodiment of the invention. In such modified form, however, the stove indicated by 9 is provided with a single smoke outlet 35 extending, as shown, through a nipple 36 of the stove top 34 and the heating chamber 12 is provided in a tubular casing 87 separate and apart from the stove. As illustrated, the casing 37 is supported by the floor 38 of a. room and both the up-flow flue 23 and the downflow fiues 24 are connected to said nipple by coupling means comprising a fitting 39'with an inlet 40 from the stove and three outlet branches,

of which the branch 41 communicates with the by-pass pipe 29 and the other branches 42 communicate with elbows 25 which, in turn, communicate with the down-flow flues 24. With connections such as being now considered, control for the by-pass is in a damper 31 located therein. To regulate the apparatus, the operator primarily adjusts the damper 31 to cause the combustion gases to pass exclusively through the by-pass 29 until a strong chimney draft has been established whereupon the damper is adjusted to close theby-pass to effect the circulation of the hot gases, as indicated' by the direction arrows in Fig. 7 to cause an upflow of air into and through the heating chamber 12 as denoted by feathered arrows in Fig. 6. Similar to the preferred embodiment shown in Figs/1 to 4, the downflow and upflow fiues of the modified construction are each of substantiallythe same diameter whereby the heating efiiciency of the apparatus is materially increased. I

The construction and operation will be understood from the foregoing description.

What I claim is 1. The combination with a stove having a combustion chamber, and a smoke pipe, of heating apparatus comprising a vertically disposed casing having open ends, a horizontal manifold provided within the lower portion of the casing and supported thereby, three vertical fines of substantially the same horizontal internal areas arranged in side by side relation and extending up wardly from the manifold, the central flue having its upper end communicatively connected to said smoke pipe, a by-pass pipe communicatively connecting said combustion chamber with the smoke pipe, the other two of said flues having their upper ends communicatively connected directly with the combustion chamber, and a damper provided for said by-pass pipe to cause the gases from the combustion chamber to enter the smoke pipe selectively through the bypass pipe or through all of the fines and the manifold.

2. The combination with a stove having a combustion chamber, and a smoke pipe, of heating apparatus comprising a casing provided with an air passage extending vertically therethrough, said casing being provided with an aperture in each of its side walls adjacent the lower ends of the same, a manifold havingthe ends thereof extend through the respective casing apertures, one end of said manifold being provided with a cleanout opening, a closure therefor removably connected to the manifold, two horizontally spaced downflow flues provided within said casing and serving to communicatively connect the upper portion of said combustion chamber with the manifold, an upflow flue located between the aforesaid flues and serving to communicatively con- 100 nect the manifold with said smoke pipe, a by-pass pipe connecting the upper portion of the combustion chamber with said smoke pipe, and a damper coacting with the bypass pipe to afford a direct draft from the 1 combustion chamber to the smoke pipe or to cause the products of combustion to travel through all of the fiues and the manifold before reaching the smoke pipe.

Signed at Seattle, Washington, this 2nd 110 day of October 1924.

- ALBERT C. MACBETH. Witness:

PIERRE BARNES. 

